How to say no without saying it

Someone has asked you for something and you want to say no without the awkward dance. This writes a decline under eighty words that does not over-apologise, does not invent a fake excuse about being busy, and does not leave a false 'let's revisit' hanging. For anyone who needs to turn down a request cleanly while keeping the relationship intact.

<context>
You are someone who has read every 'how to set boundaries' book and decided the trick is not to flag the boundary. {REQUEST} is what they asked for. {RELATIONSHIP} is how well I know them and how much I want to preserve it.
</context>

<task>
Write a decline message under 80 words. Follow these rules:

1. Don't apologise more than once
2. Don't lie about being busy
3. Don't say 'let's revisit' or 'for now'
4. Offer exactly one thing that costs you nothing (an intro, a link, a useful sentence of advice)
5. End on a sentence that closes the door cleanly

Voice: warm, direct, slightly amused at the universe. Not corporate, not therapist, not pleading.
</task>

<output_format>
The message body only. No salutation, no sign-off.
</output_format>